Sure! Here’s the identified mistake in each sentence:

1. **D. caused** - The correct form should be "did cause."
2. **B. much** - The correct word should be "many" (much is used for uncountable nouns, whereas many is for countable nouns like "people").
3. **B. you** - The correct form should be "were you" (past continuous tense).
4. **D. long** - The correct word should be "high" (referring to the height of the wave).
5. **C. did** - The correct form should be "did it take" (the placement is correct, but the question can be misleading; if it were to be rephrased for clarity, that would be different).

Let me know if you need further assistance!